Direct observation of chemical short-range order in a medium-entropy alloy | |
Chen XF(陈雪飞)1,2; Wang Qi3; Cheng Zhiying4; Zhu ML(朱鸣柳)1; Zhou Hao5; Jiang P(姜萍)1; Zhou LL(周玲玲)1,2; Xue QQ(薛琪琦)1,2; Yuan FP(袁福平)1,2; Zhu Jing4,5; Wu XL(武晓雷)1,2; Ma En6 | |
发表期刊 | Nature |
2021-04-28 | |
卷号 | 592页码:712-716 |
摘要 | Complex concentrated solutions of multiple principal elements are being widely investigated as high- or medium-entropy alloys (HEAs or MEAs)1,2,3,4,5,6,7,8,9,10,11, often assuming that these materials have the high configurational entropy of an ideal solution. However, enthalpic interactions among constituent elements are also expected at normal temperatures, resulting in various degrees of local chemical order12,13,14,15,16,17,18,19,20,21,22. Of the local chemical orders that can develop, chemical short-range order (CSRO) is arguably the most difficult to decipher and firm evidence of CSRO in these materials has been missing thus far16,22. Here we discover that, using an appropriate zone axis, micro/nanobeam diffraction, together with atomic-resolution imaging and chemical mapping via transmission electron microscopy, can explicitly reveal CSRO in a face-centred-cubic VCoNi concentrated solution. Our complementary suite of tools provides concrete information about the degree/extent of CSRO, atomic packing configuration and preferential occupancy of neighbouring lattice planes/sites by chemical species. Modelling of the CSRO order parameters and pair correlations over the nearest atomic shells indicates that the CSRO originates from the nearest-neighbour preference towards unlike (V−Co and V−Ni) pairs and avoidance of V−V pairs. Our findings offer a way of identifying CSRO in concentrated solution alloys. We also use atomic strain mapping to demonstrate the dislocation interactions enhanced by the CSROs, clarifying the effects of these CSROs on plasticity mechanisms and mechanical properties upon deformation. |
DOI | 10.1038/s41586-021-03428-z |
收录类别 | SCI |
语种 | 英语 |
WOS记录号 | WOS:000645368900011 |
论文分区 | 一类 |
RpAuthor | Zhu jing, Wu Xiaolei, Ma En |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/86258 |
专题 | 非线性力学国家重点实验室 |
通讯作者 | Zhu Jing; Wu XL(武晓雷); Ma En |
作者单位 | 1.State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China. 2.School of Engineering Science, University of Chinese Academy of Sciences, Beijing, China. 3.Science and Technology on Surface Physics and Chemistry Laboratory, Jiangyou, China. 4.National Center of Electron Microscopy in Beijing, School of Materials Science and Engineering, Tsinghua University, Beijing, China. 5.Nano and Heterogeneous Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, China. 6.Center for Alloy Innovation and Design (CAID), State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, China. |
推荐引用方式 GB/T 7714 | Chen XF,Wang Qi,Cheng Zhiying,et al. Direct observation of chemical short-range order in a medium-entropy alloy[J]. Nature,2021,592:712-716. |
APA | Chen XF.,Wang Qi.,Cheng Zhiying.,Zhu ML.,Zhou Hao.,...&Ma En.(2021).Direct observation of chemical short-range order in a medium-entropy alloy.Nature,592,712-716. |
MLA | Chen XF,et al."Direct observation of chemical short-range order in a medium-entropy alloy".Nature 592(2021):712-716. |
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